Mixing-machine.



F. H. WEBSTER.

MIXING MACHINE.

Patented Mar. 4,1919.

6 SHEETS-SHEET 1- F. H. WEBSTER."

mlxms MACHINE v APPLICATION FILED SEPT-2h 1914- I I 1,296,445. IBanented Mar. 1919.

'5 SHEETS-SHEET a.-

WWW/ZS s Q, s .TWWM/UR:

F. H. WEBSTER.

MIXING MACHINE.

' APPLICATION FILED SEPT- 21,1914- I 1,2964%5. I Patented Mar. 4,1919.

6 SHEETS-SHEET 4.

F. H. WEBSTER; MIXING MACHINE.

APPLICATION FILED sEPT.2I. m4. 1 ,296,4=4:5. Patented Mar. 4,1919.

6 SHEETS-SHEET 5.

YY Elias s L s W M flame/( 1. 2M

F. H. WEBSTER MIXING MACHINE. APPLICATION FILED sEPT.2\, 1914.

Patented Mar. 4,1919.

6 SHEETS-SHEET 6.

,NITE S FREDERICK H. WEBSTER, 0F OAKLAND, CALIFORNIA, ASSIGNOR 0FONE-HALF TO CHARLES L. BROWN, OF SAN FRANCISCO, CALIFORNIA.

MIXING-MACHINE.

Specification of Letters Patent.

Patented Mar. 4, 1919.

Application filed September 21, 1914. Serial No. 862,712.

To all whom it may concern:

Be it known that I, FREDERICK H. WEB- STER, residing in Oakland, in thecounty of Alameda and State of California, have invented new and usefulImprovements in Mixing-Machines, of which the following is adescription. I

This invention relates to continuous mixing tubes, and an object of theinvention is to improve the mixture of the substances acted upon bycarrying out certain impor tant functions.

My more specific object is to produce a mixer whose action on all theconstituent materials of concrete shall be alike and positive,comprising the constantly recurring selection of portions of the massbeing mixed and the placing of said portions in new re-.

In the drawing in which the same numeral is applied to the same portionthroughout:

Figure 1 represents'a side elevation of the mixer.

Fig. 2 is a plan view of the several sections of the mixing tube shownseparated from each other and looking toward their inner sides, thevertical arrangement being the same as Fig. 1.

Fig. 3, represents a transverse sectional view of the mixing chambertaken on the dotted line l1 in Figs. 1 and 2.

Figs. 4 and 5, both represent a transverse sectional view of the mixingchamber as it may be constructed as will hereinafter appear, taken onany line occurring between the division plates.

Fig. 6, is illustrative (so far as may be) of the transverse motiongiven mater1als 1n In the drawings A represents a cylindrical mixingchamber or tube of any suitable diameter and length which may be mountedor supported in any well known manner or as illustrated in Fig. 10f thedrawings. The cylindrical mixing chamber A is surrounded by two ringwheels 7 and is carried on rollers 22, supported on skeleton frame 3.The frame 3 may be supported on skids 4: and bolts 6 carried bystandards 5. The mixing tube is revolved by gear wheels 88, from shaft9, which may receive motion at suitable speed. Y and Y are idle wheelsto receive the thrust.

In operation the materials to be mixed are combined and fed into thehopper 10 from ivhezre they enter the mixing tube by an in- By referenceto Figs. 2 and 3 in which the division plates that cross thelongitudinal valleys 11, are marked 12, it will be seen that the insideoutline of the mixing chamber A consists very largely of cups orcavities as well as valleys. Or to further explain the insertion of thedivision plates 12 at an oblique angle has transformed the longitudinalvalleys 11 into many shorter valleys, these shorter valleys areessentially cups or cavities that are arranged helically in theperipheral wall of chamber A. Calling these short valley cups, I havemarked them 13 in Fig. 2. The spaces between the valleys 11, I havemarked X. Division plates 12 may or' may not be in complete contact withthe valleys 11, in cases only for support as shown in Fig. 3; thisconstitutes 'a sluice-way between said members.

From Fig. 2 it can be seen that the mass 011 entering the revolvingmixing chamber A is handled by cups 13 in small batches. In a generalway the handling consists of picking up material in batches at a lowpart of chamber A and carrying it up in batches on the rising side ofsaid chamber to where it is released; a part by'sliding and rolling anda part by being dumped out of the ascending cups; arriving.

To further explain, looking at a crosssection view of chamber A inoperation with material in it, we find said material in three separateand distinct conditions, z'. 6., a part dormant in the device and movingwith the device, a part rolling over and over on itself, and a partfalling clear. In describing this manifold manipulation I will separateit into two classes; one, latitudinal and one, longitudinal, and forconvenience assume chamber A to be in operation in a horizontalposition.

In the latitudinal handling; the cups 13, having picked up a load(overload), rising, carry the load till the rear portion (in relation totravel) is discharged by being thrown over upon the mass inthe bottom ofthe tube. The mass then lands, arriving in other cups 123, at theinstant at a lower altitude--and in combination with this function ofcups 18, is their other function, e. of causing the forwardtravel of themass. The spilled portion rolls on'mater-ial being carried up. Thesereversemove ments set up a rolling and tumbling together, with a;wave-likemotion of material; a veryeflicient principle in fine grinding.This rolling wave is distinctly an internal movement;

The material thrown out of the cups passes over the rolling wave andarrives against the reversely moving peiiplheral wall of chamber A withforce, setting'up the coarse grinding principle exhibited in severalreduction machines.

The sliding masses and the dumped masses are in constant alternation;

WVith chamber A in rotation at a suitable speed there is not anindiscriminate flowing otthe mass to the lowest altitude in the mixer,with the attendant disabilities. All the mass is handled twice at eachrevolution which, remembering the speed such mixers may be operated atgives much manipulation, within a given timewater has not time toindependently circulate it is carried the general circulation. r

The longitudinal handling isset up by the division plates 12 whose angleto the tube axis governs the mass movement. The angle" oi thecupsmay bemoreor less obliqueto the axis and will be made such as detains themassin the tube for the desired time,

Reference is here made to Fig. 2 -where division plates 12' crossvalleys 1-1 obliquely ri'se'from said: valleys vertically and. to Fig;9, section G,'wl1'ere' division plates 12- cr'oss valleys 11 obliquelyand. rise in said valleys obliqu'elythe obliquity of the rise being inopposite directions in alternate valleys: The obliquity oil the'rise maybe: al li-on'e-way and in either direction.

With the device in operation the area of the inlet Z is: maintained atsize only suflicient to admit the desired amount of material; hence airis.- only admitted into chamberA feed and) asit is entrained in'thefeedt Air. adhering: te -material is ground ofii, and-entrained airbeing setin motion and seeking: the way ofi'l east resistance, goesto=theportion1o chamberA transiently un-- occupied by material.

It is-apparenttronr Figs. 1 and 2, wherein! the dotted lines 14-14 and1414 in Fig. 2 are vertical, that by operating the chamber A as thereinshown, gravity will lend aid in the conveying movement,- increasing thecapacity and at the expense of the time of mixing. To increase the timeof mixing (as against such mounting) remove bolts 6 in standards 5 andlower frame 3 so" bolts 6' can be inserted inbolt holes lower 16instandards 5 when chamber A will be horizontal and the dotted lines17'17 and 1717 in Fig. 2 will be vertical. A further increase in: thetime of mixing will be accomplished as the oblique-angle at whichdivision plates 12 cross the valleys 11 in Fig. 2 is changed, so as toapproach nearer to a right angle. The plates 12 may be inclinedrearwardly' as the valleys-marked with a circle, Fig; 9, it itis desiredto increase the time of mixing.

By reason of the large cross section area of load, such chambers A canhandle andset up the described functions; the longitud-inalmovement maybe made very slow and yet give a large product, within feasible size otchamber A.

Having thus shownthe principles of my invention in: my preferred form,let us look at the device again and we at once see other formsin whichit-may be applied.

The shape of the parallel valleys .11 need not be one-half ofa circle,nor their number four. Many shapes of valleys and irregular shapedvalleys and various numbers of valleyswill cause thefunctions described.See Figs. 4 and 5 illustrating. two of the many;

Also if Figs. i and 5 berotated oppositely to the way indicated, theperiphery speed may be greater, causing still more movement to materialin a unit of time.

The valleys 11: need not be spaced apart they may join. Againreferringto Figs; 4: and 5. V

Division plates 12 may extend only partially across valleys'll, as shownin Fig. (i,- or division plates 12 may be less. in extent than shownFig. 4%, extending say from the top of valley 11 on its rearsi-d'e (inrelation totravel) and on a line so they will fade away against theopposite side of said v lley, say two-thirds way across.

.Division plates 12 may cross valleys 11 at oblique angles and bealinedaround the peripheral wall in circles, as shown in Fig. 7, sectionB, or they may rise from the valley (11) bottom at an oblique angleasshown in Fig; 7, section C.

Division plates 12n1ay cross the valleys- 11 at right angles thereto:and-be alined in peripheral wall in circles, and in alternate valleys11- rise i rom: the bottom of said: valleys Vertically and: at obliqueangles+as shown'in Fig.1 8, sectionD.

Division plates 12 may cross the valleys- 1 at right anglestheretosandbe-alineddn peripheral wall in circles, and rise at oblique angles invalleys (11) so that in alternate valleys (11) the division plates 12are inclined in opposite directions and at different angles as in Fig.8, section E.

Division plates 12 may cross the valleys 11 at right angles thereto,rising from said valley bottoms at right angles and be alined inperipheral wall of chamber in step sequence as shown in Fig. 9, sectionF.

This invention will transport concrete and mix it in transit. I wish itunderstood however that I do not limit myself to'specific use; withinits adaptations I have found said device will mix to essentialhomogeneity any loose mass (size of particles suitable to size ofmachine) 0r fluids.

Having thus described my invention what I claim and desire to secure byLetters Patent is:

1. A mixing drum comprising a chamber with cups in its peripheral wall,and having division plates in said cups; said division plates beinginclined, substantially as described.

2. A mixing drum comprising a chamber with longitudinal cavitiestherein, forming cups in its peripheral wall, and having divisionalplates in said cups spaced from said Wall forming subterfluous passages.

3. A mixing drum having its shell corrugated in cross section formingcups and provided with inclined division plates in said cups spaced fromsaid shell forming subterfluous passages as described.

4:. A mixing drum comprising a chamber with longitudinal cavitiestherein forming cups in its peripheral wall, and having divisionalplates in said cups extending partially across said cups, substantiallyas described.

5. A mixing drum comprising a chamber with cups in its peripheral wall,and having perpendicular division plates in said cups; said divisionplates being stepped in their sequence in said drum, substantially asdescribed.

6. A mixing tube having depressions in its peripheral wall forminglongitudinal cups and furnished with division plates thereln, dividingsaid cups into manifold cups, substantially as described.

7. A mixing tube closed at one end except an inlet; said tube havingdepressions in its peripheral wall forming longitudinal cups and havingdivisional plates in said cups, set therein substantially as described.

8. A mixing machine comprising a revoluble drum having longitudinallyextending recesses, and a series of division plates in the severalrecesses, substantially'as described.

9. A mixing machine comprising a drum having a series of longitudinallyextending recesses therein, means to support said drum for rotation inan inclined position, means to rotate the drum, and a series ofpartitions inclined to the axis of the drum in each recess.

10. A mixing machine comprising a revoluble inclined drum having pocketsextending throughout its length, a series of spirally arrangedpartitions in the several pockets, and means to rotate the drum.

In testimony whereof, I have hereunto set my hand in the presence of thetwo subscribing witnesses.

MELLA S. NIsBET, J. F. BETHEL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

